Quit smoking weed now. Get help to do so if you need it. There are a number of reasons for this. The previous two posters suggested some of them.
In addition, there is the issue of escalation. Of course not everyone who smokes marijuana goes on to harder drugs, but
almost everyone who takes hard drugs starts with marijuana. As a nurse you will have relatively access to narcotics and other mind-altering drugs. If you stopped smoking weed recently and now are considering starting again, what will happen when you are stressed out in nursing school and can easily put your hands on stronger substances?
There is a subforum on here called "Nurses / Recovery". This is the description:
Nurses and Recovery is about addictions and recovery. Nurses and other health care professionals can find information, education and support. Posts seeking medical/legal advice relating to criminal history are not allowed. Members must contact their individual State Board of Nursing for that information.
Maybe you'd like to take a look there, maybe ask some questions.
I wish you tons of luck in your chosen career. Give yourself a fair chance to succeed in it. Nursing rocks!